Hot air furnace casing



July 7, 1931. R, M, BAKER 1,813,013

HOT AIR FURNACE CASING Filed Jun'e 17, 1930 Patented July 7, 1931 ROBERT M. BAKER, TOLEDO, QHIO.

HOT AIR FURNAGE' CASING Application filed June 17,

This invention relates to furnaces of the hot air type commonly employed forresidence heating purposes, and an object is to produce a furnace casing which contains the new and improved features of construction and arrangement which enhance the efficiency of its operation.

The invention is shown by way of illustration in the accompanying drawings, in

which:

Fig. 1 is a vertical, sectional elevation on the line 1-1 of Fig. 2 showing the furnace casing construction and the passage of air from the outside through the casing to the warm air outlets; and

Fig. 2 is a transverse, sectional view on the line 2 2 of Fig. 1.

Referring to they drawings, the furnace casing comprises a substantially square sheet metal structure having side walls l and a top wall 2, the latter having warm air outlet ducts 3, to which are connected the usual pipes for conveying the heated air to ythe various rooms of the building. The

side walls 1 are extended above the top wall 2 and a layer 2a of heat insulating material, such as sand, covers the top wall, the side wall extensions holding this layer in place.

. At the front of the casing is the usual door 4 through which coal may be delivered to the irebox 5. From the fire box 5 leads the smoke pipe 6, which extends through one of the side walls as shown in Fig. 2.

Arranged in opposed relation and joined to the adjacent side walls are air inlet boxes 7, which in plan are substantially frusv to-triangular, and open directly to the interior of the casing. Thus, the opening from the inlet boxes 7 to the interior of the casing is co-extensive with the width of the casing. This enables a relatively large volume of cold air to be delivered to the casing chamber 5a and thoroughly distributed throughout such chamber, thereby enabling the furf-' nace to handle the maximum volume of air.

In the top wall 8 of each inlet box 7 is a cold air inlet duct 9, to which may be connected asuitable pipe for supplying fresh or relatively cold air to the furnace. It will be vobserved that the boxes 7 are disposed on 1930.Y serial No; 461,194.

opposite sides of the furnace, and the combined area of the openings from these boxes to the furnace provides for a substantial volume of air to be .furnished to the furnace. As shown, the height of the boxes 7 is slight- 55 lyr less than one-half the height of the furnace casing, although these proportions may be varied.

Spaced from the side walls l of the casing is a supplemental wall or partition 10, which extends continuously about the inside of the casing, and terminates adjacent the door 4. The partition 10 is spaced a short distance from the side walls 1 to provide a space 11 therebetween. This spac- 65 ing is effected by U-shaped spacers 12, which extend longitudinally of the casing and are held in place by rivets 13.

The top edge of the partition 10 is spaced a short distance from the top 'wall 2 of the 70 casing, and the lower end of the partition is spaced from the base of the furnace, although, as will be observed in Fig. 1, the spacing at the lower end of the partition 'covers a substantial portion of the openings 75 which lead from the air inlet boxes 7 to the interior of the furnace casing. This arrangement serves to divide the currents of air passing into the boxes 7, the greater portion of this air passing beneath the partition 10 into the casing chamber 5a and thence upwardly to the warm air outlets 3. A small portion of the air passes upwardly through the space 1l formed by the partition 10, and thence past the upper end of the partition for mixture with the heated air. This arrangement greatly enhances the efliciency of the furnace in that the cool air in the space 11 absorbs heat from the partition wall 10 and keeps the outer wall l 90 of the casing cool, thereby preventing dissiypation of heat into the furnace room through the outer or side wall 1. The spacers 12 not only provide additional channels for the passage of air, but also keep the upwardly moving currents of air in well defined paths.

It is to be understood that numerous changes in details of construction and arrangement, as well as choice of materials, may be effected without departing from the 10 l s Y. f :1,813,013l l spirit of the'invention', especially as delinedi vin the appended claim.' Y l Y Y Y :What I claim asv new and desreto secure by LettersPatentiS: f j A, o Y

A furnace casingincludng opposite sideY Y r-Walls, and a top Wall having a Warm air out e Y p 4 let,A a pairI of vertical*andyoppositely `disj *Y v .I posed cold air'inletfboxes each'laving acold; "I f air inlet at its top7 said boxes having voperi Y flo Vinner sides of a Width equalling the Widthofand. connected to the'respe'ctive' opposite; Y 'ff nadjacent sidewalls of thecasing, `and a par-v i A tition spaced from the side Wallsof the"V casi-" l jing and .having its top spaced from the t0p v ,Y .s v 15 .Wallof the casingY and its bottomyprojectingx'nY i for a distance be'lov'vlthe cool airinlets of the(Y v boXesvvhereby't'he nletto' the 'space betweenthe-outer' sidefof'thepaitton isflocated at..- z aidstanc'eabove the nletto-the inner side" 20' of the' partition. l 2

YIn testimony ivvhereo have hereuntojv signed-myvname to'this specification.` A i Y Y. f VHROBlElRTwM. BAKER. 

